Stereo Modulator vs springVerb
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Stereo Modulator
This audio effect plugin transforms mono sound into stereo, adding width and depth. It uses micro-delays to create a natural sense of space, with optional LFO modulation for a Leslie speaker-like effect without pitch shifting. Ideal for creating separation in mixes, especially for guitars and vocals.
- Mono to stereo conversion
- Adjustable stereo width
- Optional LFO modulation
- Micro-delay de-correlators
- Creates natural spatial depth
- No pitch shifting or echo
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Stereo Modulator is an AU3 effect that converts mono sound into stereo, with an adjustable width and optional LFO modulation. It works by using a bank of randomized stereo de-correlators that apply micro-delays to introduce random differences between the spectrums of the left and right audio channels. In its output we hear a natural sense of space that is not present in mono recordings. It's similar to the sound space one gets from using a stereo reverb plugin except that it is tight and clear, without echo. It can operate either as a static effect or it can be gently modulated by a low-frequency oscillator. The modulation is akin to the sound of a Leslie speaker, except that it doesn't do any pitch shifting, so the output remains focused and tuning is not compromised. This effect is especially useful for mixing overdriven electric guitar sounds together with vocals. Using Stereo Modulator on the guitars, we can push them out to the sides, creating a space in the centre for the vocal to cut through, without needing to reduce the volume of the guitars. NOTE: Stereo Modulator is an AU3 plugin only, not a standalone app. To use it, you will need an audio unit host app such as Garageband or Audiobus.
springVerb
This app offers a wide range of vintage and modern spring reverb effects for music production. It features 14 distinct spring modes and extensive controls for deep sound customization, including EQ and automation. Presets can be saved and shared across platforms.
- 14 Spring Reverb Models
- 16+ In-depth Controls
- Built-in 3-band EQ
- Preset Manager
- Cross-platform Preset Sharing
- Automation Control
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Vintage Vibes, Timeless Reverberations Spring reverb has a long history, making its debut on organ sounds and rapidly gaining attention after being built into some of the most famous guitar amps known to man. In today's musical world, spring reverb is now pretty much used on anything that could use just a touch of ambience. Experience Spring in Full Spectrum with 14 Vibrant Spring Modes springVerb is packed with 14 spring modes to give you a wide range of spring sounds to take your sounds to the next level. Fully Customizable Sound for Any Situation Unlock the full sonic potential of each mode with in-depth controls; Mix, Dampening, Ducking, Left/Right Repeats and Decay. Their three band EQ Section (Low, Mid, and High), and master controls (Master Volume & Pan). Seamless Integration Across Platforms. All settings can be saved and loaded in your sessions as well as cross platform presets. All parameters offer automation control to get the most expressive sound. Features - 14 Spring Reverb Models; ranging from early/vintage styles to creatively inspiring and modern/futuristic - Over 16 In-depth controls to sculpt your reverbs, including: Pre Delay, Decay, Damping, Repeat Speed, Ducking, and more! - Built-in 3-band EQ section for additional sonic character control - Preset Manager with Save, Save As, Rename, and Delete functionality - Over 20 Factory presets, including both Send and Insert styles - Cross-platform support: presets can be shared between iOS and macOS & Windows
Screenshots
Verdict
The clearest difference is review sentiment: Stereo Modulator at 100% against springVerb's 0%. Stereo Modulator also leads on rating (5.0 vs 3.9) and price ($2.99 vs $4.99). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Stereo Modulator costs $2.99 and springVerb $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Stereo Modulator holds the better App Store score, 5.0 against 3.9. Both are backed by a comparable volume of ratings — 3 and 7 respectively. Written reviews point the same way: 100% of Stereo Modulator's written reviews are positive against 0% of springVerb's.
Stereo Modulator ships an update every 3 months, springVerb every 5 months. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.
| Parameter | Stereo Modulator | springVerb |
|---|---|---|
| Price | $2.99 — better | $4.99 |
| Rating | 5.0 (3 ratings) — better | 3.9 (7 ratings) |
| Positive reviews | 100.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 3 | 7 — better |
| Update frequency | Every 3 months — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 2 MB | 80 MB |
| Age rating | 4+ | 4+ |
| Developer | Blue Mangoo Consulting Company Limited | OSC Audio |
Customer experience
Stereo Modulator
springVerb
In-app purchases
Stereo Modulator
No in-app purchases
springVerb
No in-app purchases









